Dna does not contain the nitrogen base a. adenine b. cytosine c. uracil d. thymine

The correct answer will be option-C.

Explanation:

Deoxyribose nucleic acid or DNA is the genetic material of the organisms.

The DNA exists in double-helical form whee each strand is composed of nucleotides. Each nucleotide is composed of a five-carbon sugar, four types of nitrogenous bases: adenine, guanine, cytosine and thymine and a phosphate group. They lack uracil which is a component of the Ribonucleic acid strands.

Thus, Option-C is the correct answer.

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion